Hypermedia Research Work

1
Hypermedia Research Work

• Designing Web-based applications with Object
  Oriented Hypermedia Design Method
• OOHDM

2
Scheduling

• Introduction
• OOHDM Methodology
• Web Design Patterns
• Web Design Frameworks
• Conclusions

3
Introduction

• HDM was released in 1993
• OOHDM was released in 1995
• Not evidence of success
• UML 1.0 appeared in 1997
• OOHDM enriched with new versions and add-ins
• New approaches Design Patterns and Frameworks

4
OOHDM Methodology

• An extension of the Unified Process
• Targets
• Systematize the process
• Minimize complexity
• Increase reusability
• Use of design tools
• Engineer dream Automatic implementation

5
A sample application

• A web-based virtual CD store where users can
• Browse CDs by author, subject or relationship
• Add CDs to the shopping cart
• Order the purchase

6
Requirements Gathering

• Capturing and specifying the functional
  requirements
• Analysis of documents and interviews of users
• UML suggest the use of Use Cases Diagram
• OOHDM introduces the User Interaction Diagrams
  (UIDs)

7
Use Cases Diagram

• Specification of the different roles and
  operations

8
User Interaction Diagram
9
Conceptual Design

• Underlying structure of the information
• Independence of the presentation
• UML Class Schema

10
Navigational Design

• Navigational Class Schema

11
Navigational Design

• Navigational Context Schema

12
Web Design Patterns

• Idea from a urban architect Christopher
  Alexander
• Adapted to Software Engineering in 1998
• Each pattern describes a problem and its solution
• The key is reusability

13
Web Design Patterns

• Portal Pattern
• Problem Advertise changes and news in a site
• Solution An entry point with arbitrary links

14
Web Design Patterns

• Active Reference Pattern
• Problem Users dont know where they are
• Solution Visual information about the path

15
Web Design Patterns

• Landmark Pattern
• Problem Navigational redundancy
• Solution Links to other areas of the
  application

16
Web Design Frameworks

• Patterns allows the reuse of parts of the
  architecture
• Allow reusing concrete designs in a domain
• OOHDM-Frame
• Generic Conceptual Model
• Generic Navigational Model

17
Web Design Frameworks

• Generic Conceptual Model

18
REFERÈNCIES
 1 D. Schwabe, F. Garzotto, P. Paolini, "HDM-
A Model Based Approach to Hypermedia Application
Design", ACM Transaction on Information Systems,
Vol. 11, 1, Jan. 1993, pp. 1-26. 2 D.
Lange, "An Object-Oriented design method for
hypermedia information systems", Proceedings of
the 27th. Annual Hawaii International Conference
on System Science, January 1994. 3 Design
Patterns, Elements of Reusable Object-Oriented
Software by Erich Gamma, Richard Helm, Ralph
Johnson, and John Vlissides (The Gang of
Four). 4 D. Schwabe "A Diagrammatic Tool for
Representing User Interaction in UML", Lecture
Notes in Computer Science, forthcoming, Proc.
UML2000, York, 2000. 5 D. Schwabe "Systematic
Hypermedia Application Design with OOHDM", March
1996 6 D. Schwabe, Gustavo Rossi, Fernando
Lyardet "Patterns for Designing Navigable
Information Spaces", 1999.